PU20X70X25-2RS PU Covered Bearing 20x70x25mm SealedPU20X70X25 2RS Polyurethane Rubber PU20X70X25 2RS Polyurethane Rubber Bearing with tire 20x70x25mm Sealed Miniature PU20X70X25 2RS Polyurethane Rubber sealed Ball Bearing 20mm x 70mm x 25mm Polyurethane ( PU) is a new type of polymer composite materials between rubber and plastic, offering higher load bearing capacity compared to plastic, polyurethane offer superior impact resistance, while good mechanical properties. Polyurethane have better abrasion